I have the adapter supplied by Kelly @ Kraz Kool, so the moderator snugs up flush with the front of the shroud. The distance between the front of the air cylinder and the front edge of the shroud is 11.5mm. The front sight height is 3.5mm, so may have to allow clearance for it so it doesn't interfere with screwing it onto the adapter.It may be possible, if the gap is predictable and the same from one pistol to the next. Probably depends on how close a gap you want nominally?
I modelled the pistol from dimensions provided to me by IMADMAN. Dimension I did not have, I assumed for the sake of appearance. So, if I am provided the distance from the base of the air tank to the shroud front face, I can model what you seek, with perhaps a 1 or 2 mm gap. The gap in my model is 6.35 mm or .25". Everything looks larger, when you zoom in on it.
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